Real signal orthogonal frequency division multiplexing method and device suitable for underwater communication

The invention relates to a real signal orthogonal frequency division multiplexing method and device suitable for underwater communication. The method comprises a transmitter system for data modulation based on discrete Hartley transform orthogonal frequency division multiplexing (DHT-OFDM) and a receiver system based on discrete Fourier transform (DFT). According to the method, a real signal is used as input, the complexity of complex operation is reduced, and in order to solve the problem that the data rate is reduced due to coupling among carriers in a discrete Hartley-Orthogonal Frequency Division Multiplexing (DHT-OFDM) method, the existing method is improved based on a cyclic prefix and index modulation technology, and the complexity of complex operation is reduced. Compared with the prior art, a reliable underwater communication system is realized, 50% of pilot frequency overhead is reduced under the condition that the channel estimation precision is not lost, the spectrum efficiency is improved, and th